abs warning light?

[savoy83]

Dear all,

So, the abs light is staying on. I am going to check all parts of the system, at least as many as my limited technical know-how allows, so I have checked the front sensors are well seated, I will be checking the back ones too. But, just in case, can anyone tell me where the following parts are located?
ABS pump relay
ABS hydraulic pump,
ABS load relay,
ABS warning relay,
ABS booster unit,
ABS control unit.

It's mot is Friday. It seems a common fault. Is it likely to be an expensive fix if I am unlucky and it isn't easy to spot today?

Cheers.:confused:

[rileys dad]

Which model D1 or D2?

Get a gararge to use a diagnostic tool to find out which sensor is the problem.
If you are lucky with the fault code reset it may get you through the MOT, if not you will know exactly where the problem is.

Good luck

[savoy83]

300 tdi - N reg - 1995 might try the local specialist, cheers

[savoy83]

Found this article just a second ago. Does anyone rate it? I am oging to try it, i have nothing to lose!
My Disco is a UK-spec 1995 300 TDi XS. Regards, savoy83.

The ABS ECU itself is a standard Bosch/Wabco part. If you do some googling, you'll find that the same techniques and codes apply to many other vehicles that use this unit.

First of all, we need to find the ABS warning light relay. On mine, it's in the passenger footwell, under the glove compartment. Lever out the 3 press-in studs, and the trim panel can drop. There are half a dozen relays in there. The one we're looking for is (on mine!) nearest to you, but in the second row, "behind" some others. Difficult to explain, but obvious when you get in there. The relay bases slide onto brackets, push them about an inch "away from the wires" and they'll come free.

The one we're looking for has a green base, and has 2 black wires, 1 black/green wire and 1 brown/red wire.

Disconnect this relay - pull it out of the socket.

Now we need to find the ABS diagnostic connector. This is where I struggled. All of the internet info says it's a blue connector under a seat, but that's just on US-spec vehicles. Rave says it's a 5-pin connector near the fuse box. But I couldn’t find that either. I believe that earlier (pre-95) models used this, but later ones moved it to the main diagnostic connector. This is a 16-pin socket, located under the steering wheel, just above the clutch. You don't need to remove any trim panels to get to it - although you may want to pop out the panel it's mounted on - it's not immediately clear how the pins are numbered, so look at the colours of the wires.

The 2 pins we're interested in are pin4 (black) - ground, and pin15 (red/green) which goes to the ABS unit. If the internet sources are to be believed, the abs diagnostic wire may be black/pink on some models, and on the 5-pin connector we're interested in pins 2 and 5. But this has not been verified.

You need some way of bridging the 2 pins. A paper clip or a piece of solid-core wire is ideal.

Now, we're ready to go.

Make sure the relay is disconnected. Turn on the ignition. The ABS warning light should come on, as usual.

Bridge the 2 pins on the diagnostic connector.

After 5 seconds, the ABS warning light should go out. It will then flash a pattern. From this, we can obtain the 2-digit fault code.

first of all there will be 2 slow flashes - one longer than the other, with a gap of about 2 seconds.

Then the interesting bit. The lamp will then flash, at about one flash per second. Count these flashes - that's your first digit.

Then a pause

Then it will flash out the second digit.

This sequence will then repeat indefinitely (start, digit 1, digit 2).

If you disconnect the link when the lights are flashing, it will clear the fault. Reconnecting it will show the next stored fault. If you have patience, you can read out and clear the entire contents of the ABS memory.

In my case, all of the stored fault codes were the same - 2 flashes, then 12 flashes. So you look up 2-12 in the table below, and find "air gap, right hand front wheel speed sensor." This ties in with my own experience - I know that re-seating that sensor will temporarily cure my fault!

Hope that someone finds this information useful.

Bruce.



The following table was obtained from

http://www.bba-reman.com/content.asp...identification (http://www.bba-reman.com/content.asp...identification)

[savoy83]

Followed my own advice. The guide I lifted from another forum worked up to the point I had to find the 16 point diagnostic socket referred to in the post above. Most forum members across the web describe it as being in the drivers footwell area, and on some later models purposely located just below dash level above the drivers right knee. Mine (I Think) was in the passenger footwell area, behind the black card mascarading as trim, up against the bulkhead on one's left hand. I needed a torch to see it as it is black and there's little natural light up there. I say I think because even though I jumped each of the points with the black wire point I could not get the abs light to blink at all. So, it either isn't the diagnostic thing i need or it is and i am even more incompetent than i thought i was! Anyway, hope this new location for black diagnostic things proves useful and if anyone else does read this any chance of a few pointers?
:confused: